A kind of preparation method of manganese tetraoxide with micro-nano structure
A technology of manganese tetroxide and micro-nano structure, applied in manganese oxide/manganese hydroxide and other directions, can solve the problem of low specific surface area of manganese tetroxide, and achieve the effects of less pollution, mild reaction conditions and high manganese recovery rate.
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Embodiment 1
[0064] Add 1 part of manganese powder to 200 parts of ethanol at 40°C, add 1.4 parts of ammonium acetate catalyst, add 10 parts of distilled water and stir for 12 hours, adjust the pH to 7-9, and stir with air for 5 hours: centrifuge, wash, dry, grind After getting the product. The yield of trimanganese tetraoxide obtained was 99%.
[0065] The product has been tested and the specific surface area of the manganese tetraoxide product is 103.3m 2 / g, Mn element content 71.30%, CaO content 0.0008%, K content 0.0007%, Na content 0.0025%, S content 0.0050%. The scanning electron microscope and transmission electron microscope photos of the product are shown in Figure 2. It can be seen from Figure 2 (a), (b) and (c) that the trimanganese tetraoxide product is a hollow dumbbell structure, and Figure 2 (d) can be seen that the product is made of 10 ~ 15nm grain composition. XRD spectrum and Mn of trimanganese tetraoxide 3 o 4 The standard diffraction pattern of Figure 5 shown...
Embodiment 2
[0067] Add 5 parts of manganese powder to 180 parts of ethanol at 80~~85°C, add 8 parts of ammonium acetate catalyst, add 30 parts of distilled water and stir for 9 hours, adjust the pH to 7~9, and stir with air for 5 hours; centrifuge, wash, and dry The product is obtained after drying and grinding. The yield of trimanganese tetraoxide obtained was 99%.
[0068] The product has been tested and the specific surface area of the manganese tetraoxide product is 84.5m 2 / g, Mn element content 70.50%, CaO content 0.0010%, K content 0.0006%, Na content 0.0020%, S content 0.0070%. The transmission electron microscope photos of the products are shown in image 3 ,Depend on image 3 It can be seen that the product is a nano hollow tube structure.
Embodiment 3
[0070] Add 10 parts of manganese powder to 150 parts of ethanol at 80-85°C, add 10 parts of ammonium acetate catalyst, add 60 parts of distilled water and stir for 10 hours, adjust the pH to 7-9, and stir with air for 2-6 hours; centrifuge, wash, The product is obtained after drying and grinding. The yield of trimanganese tetraoxide obtained was 99%.
[0071] The product has been tested and the specific surface area of the manganese tetraoxide product is 72.8m 2 / g, Mn element content 70.80%, CaO content 0.0015%, K content 0.0005%, Na content 0.0025%, S content 0.0080%. Scanning electron microscope and transmission electron microscope photos see Figure 4 ,Depend on Figure 4 (a), (b) it can be seen that the product is a folded nanosheet, by Figure 4 (c) and (d), it can be seen that the product is composed of crystal grains of 10-15nm. XRD spectrum and Mn of trimanganese tetraoxide 3 o 4 The standard diffraction pattern of Figure 6 shown.
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